Colored Wiring Diagram #6A7

Two 120Vac vent switches, One Primary and One Secondary Vent Fan replacement air damper, Power Open with
ADP-1102-TWP & ADP-1101-10AS

HMIHoyme Manufacturing Inc. Special Note: Circuits are colored for
clarificationonlyand are not necessarily those found in actual installations.

Diagram #6A7:Forced Air Furnace having one
replacement air supply duct together with
twoexhaust fans, one primary that overrides the secondary,
both
controlled by
twointerlocking relay adaptors, one beingADP-1101-10ASand the otherADP-1102-TWP.

2. Two Ventilation Switchesthat supply both live and controlled 120Vac to the furnace
area;

3.Two Relay Adaptors interlocked,one being(ADP-1101-10AS)and the other
(ADP-1102-TWP).Both function as control centers to open the replacement air damper by
either the primary or secondary ventilation fan switch and/or by the thermostat setting.

OPERATION:

1.Replacement Damper opens during furnace firing.

2. Either
Ventilation Switch simultaneously turns on its own Exhaust Fan, opens the Replacement Air Damper and turns on the
Furnace Fan.

3.The
Secondary Fan cannot operate while the
Primary Fan is on.

4. Optional Switch(i.e. toggle switch) allows full control of the
Replacement Air Damper to open separately provided it is a
Power
Open type Damper.